AutoCodes – GMC – P146A 2021 GMC Sierra

P146A 2021 GMC Sierra Code - EVAP Purge Pump Speed Too High

Quick Answer

Purge capacity is being reduced by technologies that improve fuel economy. Common causes include Faulty Evaporative Emission Purge Pump, Evaporative Emission Purge Pump harness is open or shorted, Evaporative Emission Purge Pump circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P146A 2021 GMC Sierra indicates EVAP Purge Pump Speed Too High.
Common causes: Common causes include Faulty Evaporative Emission Purge Pump, Evaporative Emission Purge Pump harness is open or shorted, Evaporative Emission Purge Pump circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 241

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 18, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P146A 2021 GMC Sierra Description

Purge capacity is being reduced by technologies that improve fuel economy. The Evaporative Emission Purge Pump is used to purge stored vapors from the Evaporative Emission Canister and is required to increase the purge volumes to meet LEV 3 Evaporative Emission requirements. The Evaporative Emission Purge Pump has an integral pressure sensor for controlling purge vapors from the canister. The Engine Control Module (ECM) monitors the Evaporative Emission Purge Pump, and the Diagnostic Trouble Code (DTC) will be set when the EVAP Purge Pump Speed is greater than 55,000 RPM for greater than 5 s.

OBDII Code P146A 2021 GMC Sierra - EVAP Purge Pump Speed Too High - AutoCodes.com — P146A 2021 GMC Sierra Code - EVAP Purge Pump Speed Too High

What does this mean?

What are the Possible Causes of the DTC P146A 2021 GMC Sierra?

Faulty Evaporative Emission Purge Pump
Evaporative Emission Purge Pump harness is open or shorted
Evaporative Emission Purge Pump circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P146A 2021 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P146A 2021 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P146A 2021 GMC Sierra code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P146A 2021 GMC Sierra Code

1. What are the common symptoms of OBDII code P146A in a 2021 GMC Sierra?

- Common symptoms include rough idle, decreased fuel efficiency, and the illumination of the check engine light.

2. What could cause the EVAP Purge Pump Speed Too High code P146A in a 2021 GMC Sierra?

- Possible causes include a faulty EVAP purge valve, a damaged purge pump, vacuum leaks in the EVAP system, or a clogged charcoal canister.

3. How serious is the P146A code in a 2021 GMC Sierra?

- While the vehicle may still be operable with this code, it is recommended to address it promptly to prevent potential damage to the emission control system and ensure optimal vehicle performance.

4. Can I continue driving my 2021 GMC Sierra with the P146A code present?

- It is generally safe to drive the vehicle for a short period with this code, but it is advisable to have it diagnosed and repaired as soon as possible to avoid potential long-term issues.

5. How can I diagnose and repair the P146A code in my 2021 GMC Sierra?

- Diagnosis typically involves inspecting the EVAP system components for any signs of damage or leaks. Repair may involve replacing the EVAP purge valve, purge pump, or addressing any vacuum leaks in the system.

6. Can I reset the check engine light after addressing the P146A code in my 2021 GMC Sierra?

- After repairing the underlying issue causing the P146A code, you can reset the check engine light using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes.

7. Is it possible to prevent the P146A code from recurring in my 2021 GMC Sierra?

- Regular maintenance of the EVAP system, such as checking for leaks and ensuring proper component operation, can help prevent the recurrence of the P146A code.

8. Will addressing the P146A code improve my 2021 GMC Sierra's fuel efficiency?

- Yes, resolving the P146A code and ensuring the proper functioning of the EVAP system can lead to improved fuel efficiency and overall vehicle performance.

9. How long does it typically take to repair the P146A code in a 2021 GMC Sierra?

- The repair time for the P146A code can vary depending on the exact cause and complexity of the issue. It may take anywhere from a few hours to a full day to diagnose and repair the problem.

10. Should I attempt to fix the P146A code in my 2021 GMC Sierra myself, or is it better to seek professional help?

- While some DIY enthusiasts may be able to address the P146A code themselves, it is generally recommended to seek the assistance of a qualified mechanic or technician to ensure the issue is properly diagnosed and repaired.